Iron/Manganese removal filter
The filters for the removal of iron and manganese from water using sand of different granulometries and pyrolusite (MnO2) or other media. After the oxidation step (with or without a detention or settling tank), the source water is filtered through a filter media in either a pressure vessel or a gravity filter. In the presence of dissolved oxygen, the pyrolusite exerts a strong catalytic oxidation action on the Fe and Mn, which precipitates and is trapped in the filter bed. Later, tits eliminated by backwash. It does not need to be regenerated, and is not consumed during the process, thus having a very long shelf life. The filtration media in these systems may consist of sand, sand and coal anthracite (dual media), or propri¬etary/patented products, such as Pyrolusite - Pyrolox, Filox-R, Birm, and manganese greensand. Some media such as manganese greensand, have the ability to both oxidize and filter iron and manganese effectively and at the same time. Manganese greensand, pyrolusite, Birm, or any media coated with manganese dioxide has the capacity to oxidize iron and manganese and filter the insoluble precipitates with the filter bed. These media also have some, but limited, capacity for As(III) oxidation and arsenic adsorption.